CN106393479A - Waste paper-aluminum-plastic composite packaging material aluminum-plastic softening agent separation technology - Google Patents

Abstract

The invention discloses a waste paper-aluminum-plastic composite packaging material aluminum-plastic softening agent separation technology. The technology involves an aluminum-plastic separation module, a plastic film recycling module and an aluminum powder recycling module, and therefore aluminum-plastic separation, plastic film cleaning and recycling and aluminum powder concentration, drying and recycling can be carried out on composite packaging materials such as Tetra pak; the heat bonding layer reaction between a softening agent and an aluminum-plastic film in the composite packaging materials is beneficial to improvement of the aluminum-plastic separation efficiency in the back-end process; the corrosive effect of the softening agent on aluminum foil is inhibited through a corrosion inhibitor, the corrosion inhibition efficiency can reach 99.7%, and the purity of back-end recycled aluminum powder can be improved. Softening agent waste liquid produced through the technology can be recycled after being easily treated in a replenishment mode and the like, the purity of aluminum powder obtained through the technology can reach 99.99%, and the use value is high; and a recycled plastic film obtained through the technology is directly fed to a quality-divided value-added granulation system through hot air.

Description

A process for separating aluminum-plastic softener from waste paper-aluminum-plastic composite packaging material

technical field

The invention relates to a process method for separating aluminum and plastic in waste paper-aluminum-plastic composite packaging, in particular to a process method for separating aluminum and plastic in waste Tetra Pak.

Background technique

In recent years, with the continuous development of the global economy, the market demand for fruit drinks and milk in various countries has continued to increase, and Tetra Pak waste such as soft drink bags and milk boxes has also increased, which has caused certain pressure on the environment and resources. . Recycling waste paper-aluminum-plastic composite packaging materials is an important way to regenerate resources. Recycling and reusing the main components such as aluminum, paper, and plastic in Tetra Pak can not only relieve environmental pressure, but also bring economic benefits to related companies. Huge economic benefits; due to the large differences in the properties of paper, plastic, aluminum foil, etc., in order to efficiently recycle this type of Tetra Pak, they must first be effectively separated. At present, the main problems in the paper-aluminum-plastic separation technology of Tetra Pak are that the separation is not thorough enough to result in low product purity, the separation process system is not perfect, the recovery of products is not comprehensive enough, and the separation process cannot be industrialized. Therefore, there is an urgent need for a novel, industrializable waste aluminum-plastic separation process, so as to realize the recycling of Tetra Pak.

Contents of the invention

In view of the above-mentioned problems currently faced by the aluminum-plastic separation technology in composite packaging materials such as Tetra Pak, the purpose of the present invention is to design a kind of efficient and continuous separation of aluminum-plastic films in composite packaging materials such as Tetra Pak. A separation process method that can be industrialized. The invention is a sub-patent of "a hybrid aluminum-paper-plastic composite packaging material quality-added value-added process system" applied at the same time, which is used as a subsequent treatment process for the aluminum-plastic film produced in the paper-plastic separation process.

The purpose of the present invention is achieved in this way. The process for separating the aluminum-plastic softener of the waste paper-aluminum-plastic composite packaging material includes the following steps: 1) After removing the pulp through the paper-plastic separation process, the aluminum-plastic composite material first enters the reaction The tank is fed and discharged through the two-way rotating inner sleeve in the reaction tank. The softener and corrosion inhibitor are pre-filled in the reaction tank before feeding. At the same time, there is a hollow part on the surface of the outer sleeve to inject hot water to accelerate the reaction process of the softener and the thermal adhesive between aluminum and plastic. After about 0.4-1h of reaction, the content of the reaction tank changes the direction of rotation and discharges; 2) After the reaction, the mutual The peeled aluminum-plastic film is sent to the aluminum-plastic separator through the two-way auger, and the aluminum foil is continuously broken under mechanical action and most of it is attached to the plastic film, and then the aluminum-plastic film enters the aluminum-plastic separator through the material guide system , through high-speed centrifugal separation and water scouring, the aluminum scrap attached to the plastic film and water form an aluminum scrap liquid and collect it into the aluminum powder buffer pool, and the aluminum powder liquid in the buffer pool enters the aluminum powder purification system; 4) after the aluminum The cyclone separation of the powder purification system removes impurities, the solid-liquid separator spirally concentrates and extracts aluminum powder and the most vacuum-dried to obtain clean, high-purity aluminum powder; Recycled plastics are obtained in a film pelletizing system.

The main component of the softener is formic acid.

The corrosion inhibitor is an anionic surfactant.

The equipment for separating aluminum and plastic of waste paper, aluminum and plastic composite packaging materials according to the present invention includes a feed flotation module, a material fishing module and an overflow slag discharge module; it is characterized in that:

1) The feed flotation module is mainly composed of a water inlet pipe, a feed inlet, a flotation tank and an air blast pipe. The water inlet pipe sends paper, aluminum and plastic waste residue and water into the flotation tank through a pump outside the reservoir , the feed inlet is set above the water inlet pipe of the water inlet of the flotation tank, and the water inlet of the flotation tank is located at the upper middle of the pool wall; the gas blowing pipe is set in the middle of the step surface of the flotation tank body, 0.4 from the bottom of the slag collection tank ~1 meter;

2) The material removal module is mainly composed of a slag removal board and a collection tank. The slag removal board is composed of a plate handle and whisker-shaped plastics. Its shape is similar to a broom. The motor drives to rotate 360°; the collection tank is set at 2-5cm higher than the water level in the flotation tank, and the bottom of the collection tank is set in an inclined shape to facilitate the collection of broken films. During the process, the broken plastic film floating on the water surface can be continuously pushed into the collection tank;

3) The overflow slag discharge module is mainly composed of an overflow pipe, an overflow drain outlet, a slag collection tank and a slag discharge port. The top of the overflow pipe is provided with an overflow port. The flotation water can be continuously recycled after simple treatment; the slag collection tank is located at the bottom of the flotation tank, and the collected impurities can be discharged by regularly opening the slag discharge tank at the bottom of the slag collection tank. Mouth for decontamination.

The beneficial effects of the present invention are: the present invention mainly includes three modules: aluminum-plastic separation, recycled plastic film and recycled aluminum powder, which can realize aluminum-plastic separation, plastic film cleaning and recycling, aluminum powder and other composite packaging materials such as Tetra Pak. Concentration, drying and recovery; through the reaction of the thermal adhesive layer between the softener (a self-developed reagent, the main component is formic acid) and the aluminum-plastic film in the composite packaging material, it is beneficial to the separation efficiency of aluminum-plastic in the back-end process; through corrosion inhibition Agent (an anionic active agent) relieves the corrosion effect of softener on aluminum foil, and the corrosion inhibition efficiency can reach 99.7%, which is beneficial to improve the purity of aluminum powder recovered at the back end. The softener waste liquid produced by this process can be recycled after simple treatment such as replenishment; the purity of aluminum powder obtained by this process can reach 99.99%, and has high utilization value; the recycled plastic film obtained by this process is directly sent by hot air to separate quality and increase value. granular system. Through continuous gravity flotation and "micro-bubble" flotation, the separation of waste and debris can be realized, and the recycling rate of plastic film can be improved. The dual effects of gravity flotation and "micro-bubble" air flotation not only greatly improve the purity of the recovered shredded film, but also reduce the operating cost of recycling to the greatest extent, making the obtained shredded film cleaner and saving the cleaning time of the debris. The working efficiency is greatly improved by the continuous working mode. In addition, an overflow port is provided in the present invention, and the flotation water can be recycled with high utilization rate. At the same time, the device has a simple structure and low manufacturing cost, and is suitable for use by major related enterprises.

Description of drawings

Fig. 1 is the main process flow chart of the present invention's design.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Figure 1: Flow chart of the aluminum-plastic separation process: After removing the pulp through the paper-plastic separation process, the aluminum-plastic composite material first enters the reaction tank, (this equipment is a two-way drum reaction tank, and has applied for a patent, application number: 201220599505.0) through the reaction tank The two-way rotating inner sleeve in the inner sleeve is used for feeding and discharging, and the softener (the main component of the invention is formic acid, and the softener can adopt the conventional formula in this field) and corrosion inhibitor (the invention uses Conventional anionic surfactants and corrosion inhibitors can use conventional formulations in this field), after the feeding is completed, the inner cylinder is continuously rotated to promote the contact between the aluminum plastic film and the softener, and at the same time, there is a hollow part on the surface of the outer sleeve to inject hot water to accelerate softening The reaction process of the agent and the thermal adhesive between aluminum and plastic. After reacting for about 0.4-1h, the content of the reaction tank changes the direction of rotation to discharge the material. After the reaction, the aluminum-plastic film peeled off from each other is sent to the aluminum-plastic separator through a two-way auger. The aluminum-plastic separator and the paper-plastic separator The mechanism is similar, mainly through high-speed washing, rinsing and throwing off. This equipment has applied for a patent (application number: 201220382836.9). Under mechanical action, the aluminum foil is continuously broken and most of it is attached to the plastic film, and then the aluminum-plastic film passes through The material guide system enters the aluminum-plastic sorting machine. Through high-speed centrifugal separation and water washing, the aluminum scrap attached to the plastic film and water form an aluminum scrap liquid and collect it into the aluminum powder buffer pool. The aluminum powder liquid in the buffer pool enters the Aluminum powder purification system, the system includes aluminum liquid buffer pool, concentration pool, aluminum powder dryer, among which the aluminum powder dryer is the existing technology, through cyclone separation to remove impurities, solid-liquid separator spiral concentration to extract aluminum powder and the most vacuum Clean, high-purity aluminum powder is obtained after drying; and the plastic film after removing the aluminum scrap is squeezed dry and packed and then used in the film granulation system (the existing basic granulation technology, the present invention refers to the three-stage single-screw granulation system) granulation system) to obtain recycled plastics.

Implementation case: Xiamen Luhai Environmental Protection Co., Ltd. In the aluminum-plastic separation process, the daily processing capacity of aluminum-plastic film is 60t/day (wet weight, moisture content is about 40-50%), the aluminum content of plastic film products is 1-1.2%, and the impurity content is 1.3-2.2%; The powder output is 10t/day, and the purity of aluminum powder reaches 99.99%.

According to the equipment of the present invention, the device mainly includes a feed flotation module, a material scooping module and an overflow slag discharge module.

1) The feed flotation module is mainly composed of main components such as water inlet pipe 4, feed port 3, flotation tank 5, air blowing pipe 6, etc. The water inlet pipe 4 sends the water body into the In the flotation tank, the feed port 3 is set above the water inlet pipe of the flotation tank water inlet, and the paper, aluminum and plastic waste slag enters the flotation tank 5 together with the water body (the water inlet is located above the middle of the tank wall); The middle part of the pool body terrace is about 0.4 to 1 meter away from the bottom of the slag collecting tank 9.

2) The material removal module is mainly composed of a slag removal board 1, a collection tank 2, etc. The slag removal board 1 is composed of a plate handle and whisker-shaped plastic (similar to a broom), and the whisker-like plastic extends above the liquid surface of the flotation tank Down, rotate 360° by motor drive; the collection tank 2 is 2-5cm higher than the liquid level, and the bottom of the tank is set in an inclined shape to facilitate the collection of broken films. The slag removal plate 1 can remove the floating Plastic film on the surface of the water is constantly pushed into the sump.

3) The overflow slag discharge module is mainly composed of an overflow pipe 10, an overflow outlet 7, a slag collection tank 9, and a slag discharge port 8. After passing through the overflow pipe, it is discharged into the reservoir through the drain outlet, and the flotation water can be continuously recycled after simple treatment; the slag collection tank 9 is located at the bottom of the flotation tank 2, and the collected impurities can be discharged by opening regularly Mouth for decontamination.

The specific working principle is:

In this equipment, the waste slag enters the flotation tank 5 under the push of the water flow after being discharged from the feed port 3. function, the broken plastic film in the waste slag continuously floats up, and through the pushing action of the slag removal board 1, the material film is continuously transported to the collection tank 2 for collection; the hard plastic, silt and paper sawdust in the waste slag are directly discharged under the action of gravity. Sink into the slag collection tank 9 at the bottom of the flotation tank 5, and the impurities can be removed regularly through the slag discharge port 8 (the water lost during the removal process can also be directly reused through filtration); the water discharged from the overflow drain 7 can be returned to The storage tank is directly reused by pumping after simple treatment, and the recycling rate is high.

Claims (4)

1. A process for separating the aluminum-plastic softener of waste paper-aluminum-plastic composite packaging materials, including the following steps: 1) After removing the pulp through the paper-plastic separation process, the aluminum-plastic composite material first enters the reaction tank, and passes through the two-way rotating in the reaction tank. The inner sleeve is used for feeding and discharging. The softener and corrosion inhibitor are pre-filled into the reaction tank before feeding. After the feeding is completed, the inner sleeve is continuously rotated to promote the contact between the aluminum-plastic film and the softener. At the same time, the outer sleeve has a hollow part. Inject hot water to accelerate the reaction process of the softener and the thermal adhesive between aluminum and plastic. After about 0.4-1 hour of reaction, the content of the reaction tank changes the direction of rotation to discharge; It is sent to the aluminum-plastic sorting machine, and the aluminum foil is continuously broken under mechanical action and most of it is attached to the plastic film, and then the aluminum-plastic film enters the aluminum-plastic sorting machine through the material guide system, and is shaken off by high-speed centrifugal and washed by water function, the aluminum scrap attached to the plastic film and water form an aluminum scrap liquid and collect it into the aluminum powder buffer pool, and the aluminum powder liquid in the buffer pool enters the aluminum powder purification system; 4) through the cyclone separation of the aluminum powder purification system to remove impurities, The solid-liquid separator spirally concentrates and extracts the aluminum powder and obtains clean, high-purity aluminum powder after the most vacuum drying; 5) The plastic film after removing the aluminum scrap is squeezed dry and packed, and then used in the film granulation system to obtain recycled plastic. 2. A process for separating the aluminum-plastic softener of waste paper-aluminum-plastic composite packaging material according to claim 1, characterized in that: the main component of the softener is formic acid. 3. A process for separating the aluminum-plastic softener of the waste paper-aluminum-plastic composite packaging material according to claim 1 or 2, wherein the corrosion inhibitor is an anionic surfactant. 4. A device for separating aluminum and plastic from waste paper, aluminum and plastic composite packaging materials, including a feed flotation module, a material fishing module, and an overflow slag discharge module; it is characterized in that: 1) The feed flotation module is mainly composed of a water inlet pipe, a feed inlet, a flotation tank and an air blast pipe. The water inlet pipe sends paper, aluminum and plastic waste residue and water into the flotation tank through a pump outside the reservoir , the feed inlet is set above the water inlet pipe of the water inlet of the flotation tank, and the water inlet of the flotation tank is located at the upper middle of the pool wall; the gas blowing pipe is set in the middle of the step surface of the flotation tank body, 0.4 from the bottom of the slag collection tank ~1 meter; 2) The material removal module is mainly composed of a slag removal board and a collection tank. The slag removal board is composed of a plate handle and whisker-shaped plastics. Its shape is similar to a broom. The motor drives to rotate 360°; the collection tank is set at 2-5cm higher than the water level in the flotation tank, and the bottom of the collection tank is set in an inclined shape to facilitate the collection of broken films. During the process, the broken plastic film floating on the water surface can be continuously pushed into the collection tank; 3) The overflow slag discharge module is mainly composed of an overflow pipe, an overflow drain outlet, a slag collection tank and a slag discharge port. The top of the overflow pipe is provided with an overflow port. The flotation water can be continuously recycled after simple treatment; the slag collection tank is located at the bottom of the flotation tank, and the collected impurities can be discharged by regularly opening the slag discharge tank at the bottom of the slag collection tank. Mouth for decontamination.